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(11)

EP 1 747 343 A1

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(43) Date of publication: 31.01.2007 Bulletin 2007/05 (21) Application number: 05731862.8 (22) Date of filing: 18.04.2005

(51) International Patent Classification (IPC):  E21B 7/30(2006.01) F16L 55/165(2006.01) (86) International application number: PCT/DK2005/000264 (87) International publication number: WO 2005/124092 (29.12.2005 Gazette 2005/52)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 19.04.2004 DK 200400618 (71) Applicant: Nielsen, Knud DK-9230 Svenstrup (DK)	(72) Inventor: Nielsen, Knud DK-9230 Svenstrup (DK) (74) Representative: Jensen, Peter Kim et al Chas. Hude A/S 33, H.C. Andersens Boulevard 1780 Copenhagen V 1780 Copenhagen V (DK)